From 280eeb9d7539e5b7c8d09dfa21a7679eebb09407 Mon Sep 17 00:00:00 2001
From: syuilo <syuilotan@yahoo.co.jp>
Date: Sun, 19 Jul 2020 12:26:05 +0900
Subject: fix(client): :v:

---
 src/client/scripts/scroll.ts | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/client/scripts')

diff --git a/src/client/scripts/scroll.ts b/src/client/scripts/scroll.ts
index a915f2e9ef..be9ea22261 100644
--- a/src/client/scripts/scroll.ts
+++ b/src/client/scripts/scroll.ts
@@ -26,6 +26,19 @@ export function onScrollTop(el: Element, cb) {
 	container.addEventListener('scroll', onScroll, { passive: true });
 }
 
+export function onScrollBottom(el: Element, cb) {
+	const container = getScrollContainer(el) || window;
+	const onScroll = ev => {
+		if (!document.body.contains(el)) return;
+		const pos = getScrollPosition(el);
+		if (pos + el.clientHeight > el.scrollHeight - 1) {
+			cb();
+			container.removeEventListener('scroll', onscroll);
+		}
+	};
+	container.addEventListener('scroll', onScroll, { passive: true });
+}
+
 export function scroll(el: Element, top: number) {
 	const container = getScrollContainer(el);
 	if (container == null) {
@@ -34,3 +47,14 @@ export function scroll(el: Element, top: number) {
 		container.scrollTop = top;
 	}
 }
+
+export function isBottom(el: Element, asobi = 0) {
+	const container = getScrollContainer(el);
+	const current = container
+		? el.scrollTop + el.offsetHeight
+		: window.scrollY + window.innerHeight;
+	const max = container
+		? el.scrollHeight
+		: document.body.offsetHeight;
+	return current >= (max - asobi);
+}
-- 
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